Term
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Definition
| The Process of putting information onto a high-frequency carrier for transmission. |
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Definition
| The low frequency information that modulates the carrier. |
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Term
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Definition
| The low-frequency information modulated onto a high-frequency carrier in a transmitter. |
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Term
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Definition
| The process of removing intelligence from the high-frequency carrier in a receiver. |
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Term
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Definition
| The device that converts energy from one form to another. |
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Term
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Definition
| A relative unit of measurement used frequently in electronic communications to describe power gain or loss. |
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Term
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Definition
| dB level using a 1mW reference. |
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Term
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Definition
| 1mW measured relative to a 1mW reference |
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Term
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Definition
| A decibel measurement using a 1mW reference with respect to a 600 |
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Term
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Definition
| a measurement made using a 1mW reference with respect to a 75 |
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Term
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Definition
| A measurement made using a 1mW reference to a 50 |
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Term
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Definition
| A measurement made using a 1W reference. |
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Term
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Definition
| A measurement made using a 1uV reference. |
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Term
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Definition
| Any undesired voltages or currents that end up appearing in a circuit. |
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Term
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Definition
| Electrical noise that may occur in the output of a receiver. |
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Term
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Definition
| Noise in a received radio signal that has been introduced by the transmitting medium. |
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Term
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Definition
| Noise in a radio signal that has been introduced by the receiver. |
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Term
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Definition
| The movement of radio signals through the atmosphere from transmitter to receiver. |
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Term
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Definition
| External noise caused by naturally occurring disturbances in the earth's atmosphere. |
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Term
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Definition
| External noise produced outside the earth's atmosphere. |
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Term
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Definition
| Space noise originating from the sun. |
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Term
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Definition
| Space noise originating from stars other than the sun. |
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Term
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Definition
| Another name for thermal noise, first studied by J. B. Johnson. |
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Term
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Definition
| Internal noise caused by thermal interaction between free electrons and vibrating ions in a conductor. |
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Term
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Definition
| Another name for thermal noise because its frequency content is uniform across the spectrum. |
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Term
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Definition
| A resistor that exhibits low levels of thermal noise. |
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Term
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Definition
| Noise introduced by carriers in the pn junctions of semiconductors. |
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Term
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Definition
| Noise occurring at frequencies below 1kHz, varying in amplitude inversely proportional to frequency. |
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Term
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Definition
| Noise produced in semiconductors when the transit time of the carriers crossing a junction is close to the signal's period and some of the carriers diffuse back to the source or emitter of the semiconductor. |
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Term
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Definition
| Relative measurement of desired signal power to noise power. |
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Term
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Definition
| A figure describing how noisy a device is in decibels. |
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Term
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Definition
| A figure describing how noisy a device is as a ratio having no units. |
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Term
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Definition
| Range of frequency in which upper frequency is double the lower frequency. |
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Term
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Definition
| Method of determining the total noise produced by amplifier stages in cascade. |
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Term
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Definition
| An electronic part or system that is being tested. |
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Term
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Definition
| Method of measuring the amplitude of noise on a signal using an oscilloscope display. |
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Term
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Definition
| Theory concerned with optimization of transmitted information. |
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Term
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Definition
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Term
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Definition
| The information that can be transmitted is proportional to the product of the bandwidth times the time of transmission. |
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Term
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Definition
| A method of representing complex repetitive waveforms by sinusoidal components. |
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Term
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Definition
| A technique for converting time-varying information to its frequency component. |
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Term
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Definition
| Data points generated by the time to frequency conversion using the FFT. |
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Term
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Definition
| Errors that occur when the input frequency exceeds one-half the sample rate. |
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Term
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Definition
| Ratio of energy stored to energy lost in a component. |
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Term
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Definition
| The loss of electrical energy between the plates of a capacitor. |
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Term
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Definition
| The inverse of quality factor. |
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Term
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Definition
| The balance condition between the inductive and capacitive reactance of a circuit. |
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Term
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Definition
| The number of RC or LC sections in a filter. |
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Term
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Definition
| A filter whose capacitive and inductive reactances are equal to a constant value of k. |
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Term
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Definition
| A filter that uses a tuned circuit to provide nearly infinite attenuation at a specific frequency. |
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Term
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Definition
| The rate of attenuation in a filter. |
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Term
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Definition
| The undesired capacitance between two points in a circuit or device. |
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Term
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Definition
| A Circuit capable of converting electrical energy from DC to AC. |
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Term
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Definition
| The repetitive exchange of energy in an LC circuit from the inductor to the capacitor and back. |
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Term
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Definition
| The gradual reduction of a repetitive signal due to resistive losses. |
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Term
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Definition
| An undamped sinusoidal waveform produced by an oscillator in a radio transmitter. |
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Term
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Definition
Two requirements for oscillation.
1. loop gain must be at least unity.
2. loop phase shift must be zero degrees. |
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Term
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Definition
| An Oscillator that generates a wide range of output frequencies. |
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